CVE-2016-7777

6.3 mediumEPSS 0.3%

Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.

Severity

CVSS 3.0

6.3 medium

CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 23% of CVEs (scores of 2026-10-31)
CWE: CWE-362
Published: 2016-10-07
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

xen:xen

References

http://www.securityfocus.com/bid/93344
http://www.securitytracker.com/id/1036942
http://xenbits.xen.org/xsa/advisory-190.html
https://security.gentoo.org/glsa/201611-09
https://support.citrix.com/article/CTX217363

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